Move version display out into it's own HUD panel.

This pulls version from a version.txt file now too. If we exclude that, it won't get displayed, aaand there's a cvar for toggling it now (not archived for now). Yay.

mp/src/game/client/client_hl2mp.vpc

@@ -450,6 +450,7 @@ $Project "Client"
 					$File	fortress/hud_technologytreedoc.h
 					$File	fortress/hud_timer.cpp
 					$File	fortress/hud_timer.h
+					$File	fortress/hud_version.cpp
 					$File	fortress/hud_vehicle_role.cpp
 					$File	fortress/hud_vehicle_role.h
 					$File	fortress/hud_weaponselection.cpp

mp/src/game/client/fortress/clientmode_tfnormal.cpp

@@ -81,18 +81,11 @@ ClientModeTFNormal::Viewport::Viewport() :
 #endif
 
 	SetScheme( vgui::scheme()->LoadSchemeFromFileEx( enginevgui->GetPanel( PANEL_CLIENTDLL ), "resource/teamscheme.res", "TeamScheme" ) );
-
-	versionLabel = new vgui::Label( this, "VersionLabel", "PRE-ALPHA (v0.0.1.3)" );
-	versionLabel->SetContentAlignment( vgui::Label::Alignment::a_center );
-	versionLabel->SetWide( GetWide() );
-	versionLabel->SetPaintBackgroundEnabled( false );
 }
 
 ClientModeTFNormal::Viewport::~Viewport() {}
 
 void ClientModeTFNormal::Viewport::Paint() {
-	versionLabel->SetWide( GetWide() );
-
 	BaseClass::Paint();
 }
 

mp/src/game/client/fortress/clientmode_tfnormal.h

@@ -67,8 +67,6 @@ DECLARE_CLASS( ClientModeTFNormal, ClientModeTFBase );
 		vgui::HCursor m_CursorCommander;
 		vgui::HCursor m_CursorRightMouseMove;
 		// hogsy end
-
-		vgui::Label *versionLabel;
 	};
 
 	virtual void Update() override;

mp/src/game/client/fortress/hud_version.cpp

@@ -0,0 +1,122 @@
+/*
+"Invasion" project by TalonBrave.info, Copyright (C) 2014-2022 (see README.md for list of contributors)
+*/
+
+#include "cbase.h"
+#include "hud.h"
+#include "hudelement.h"
+#include "vgui/ISurface.h"
+#include "vgui_controls/Panel.h"
+#include "vgui_controls/Label.h"
+#include "vgui_controls/Controls.h"
+#include "clientmode.h"
+#include "filesystem.h"
+
+// memdbgon must be the last include file in a .cpp file!!!
+#include "tier0/memdbgon.h"
+
+class CHudVersion : public CHudElement, public vgui::Panel
+{
+	DECLARE_CLASS_SIMPLE( CHudVersion, vgui::Panel );
+
+public:
+	CHudVersion( const char *elementName );
+	~CHudVersion();
+
+private:
+	void Init() override;
+	void Paint() override;
+	void OnThink() override;
+	void ApplySchemeSettings( vgui::IScheme *scheme ) override;
+
+	char        versionLabel[ 128 ];
+	vgui::HFont labelFont;
+
+	static const char *GetVersionPath() { return "version.txt"; }
+};
+
+static ConVar showVersion( "show_version", "1" );
+
+DECLARE_HUDELEMENT( CHudVersion );
+
+CHudVersion::CHudVersion( const char *elementName ) : CHudElement( elementName ), vgui::Panel( nullptr, "HudVersion" )
+{
+	Panel *pParent = g_pClientMode->GetViewport();
+	SetParent( pParent );
+
+	SetActive( true );
+	SetPaintBorderEnabled( true );
+
+	SetHiddenBits( HIDEHUD_ALL );
+
+	versionLabel[ 0 ] = '\0';
+}
+
+CHudVersion::~CHudVersion()
+{
+}
+
+void CHudVersion::Init()
+{
+	CHudElement::Init();
+
+	CUtlBuffer buffer;
+	if ( !filesystem->ReadFile( GetVersionPath(), "GAME", buffer ) )
+	{
+		Msg( "Failed to fetch \"%s\", will not display version.\n", GetVersionPath() );
+		return;
+	}
+
+	const char *str = ( char * ) buffer.Base();
+	assert( *str != '\0' );
+	if ( *str == '\0' )
+		Error( "Invalid version provided under \"%s\"!\n", GetVersionPath() );
+
+	char        *end;
+	unsigned int versionMajor = strtoul( str, &end, 10 );
+	unsigned int versionMinor = strtoul( end, &end, 10 );
+	unsigned int versionPatch = strtoul( end, NULL, 10 );
+
+	V_snprintf( versionLabel, sizeof( versionLabel ), "v%u.%u.%u (Pre-Alpha)", versionMajor, versionMinor, versionPatch );
+
+	SetVisible( true );
+}
+
+void CHudVersion::Paint()
+{
+	if ( *versionLabel == '\0' )
+		return;
+
+	vgui::HScheme scheme = vgui::scheme()->GetScheme( "ClientScheme" );
+	vgui::HFont   font   = vgui::scheme()->GetIScheme( scheme )->GetFont( "CommentaryDefault" );
+	if ( !font )
+		font = vgui::scheme()->GetIScheme( scheme )->GetFont( "Default" );
+
+	vgui::surface()->DrawSetTextFont( font );
+	vgui::surface()->DrawSetTextColor( Color( 100, 255, 100, GetAlpha() ) );
+
+	int pixels = UTIL_ComputeStringWidth( font, versionLabel );
+	vgui::surface()->DrawSetTextPos( ( GetWide() - pixels ) / 2, 22 );
+
+	char *p = versionLabel;
+	while ( *p )
+	{
+		vgui::surface()->DrawUnicodeChar( *p );
+		p++;
+	}
+}
+
+void CHudVersion::OnThink()
+{
+	SetVisible( showVersion.GetBool() );
+}
+
+void CHudVersion::ApplySchemeSettings( vgui::IScheme *scheme )
+{
+	BaseClass::ApplySchemeSettings( scheme );
+
+	SetPaintBackgroundEnabled( true );
+	SetPaintBackgroundType( 2 );
+
+	SetBgColor( Color( 0, 0, 0, 255 ) );
+}