Update CI

* update to ubuntu-latest

* python3

* add missing include

* fork libopencm3 to fix makefile

.github/workflows/ci.yml

@@ -8,7 +8,7 @@ on:
 jobs:
   stm32:
     name: Hardware Platform (STM32)
-    runs-on: ubuntu-18.04
+    runs-on: ubuntu-latest
     steps:
     - name: Checkout
       uses: actions/checkout@v3
@@ -28,14 +28,14 @@ jobs:
         files: build/deploy/**/*
   sim_linux:
     name: Simulator Platform (Linux)
-    runs-on: ubuntu-18.04
+    runs-on: ubuntu-latest
     steps:
     - name: Checkout
       uses: actions/checkout@v3
       with:
         submodules: recursive
     - name: Install Dependencies
-      run: sudo apt install -y libsdl2-dev libasound2-dev mesa-common-dev python3.7 python3.7-dev
+      run: sudo apt install -y libsdl2-dev libasound2-dev mesa-common-dev python3 python3-dev
     - name: Setup
       run: make setup_sim
     - name: Build

.gitmodules

@@ -1,6 +1,6 @@
 [submodule "src/platform/stm32/libs/libopencm3"]
 	path = src/platform/stm32/libs/libopencm3
-	url = https://github.com/libopencm3/libopencm3.git
+	url = https://github.com/westlicht/libopencm3.git
 [submodule "src/platform/sim/libs/soloud"]
 	path = src/platform/sim/libs/soloud
 	url = https://github.com/jarikomppa/soloud.git

src/apps/sequencer/engine/SortedQueue.h

@@ -3,6 +3,7 @@
 #include <array>
 #include <utility>
 #include <functional>
+#include <cstddef>
 
 template<typename T, size_t Capacity, typename Compare = std::less<T>>
 class SortedQueue {