Improvements for 2021 HT1

New features

• Time the different steps in bonobo::loadObjects() to easily determine which parts are taking longer.
• Add helper code to render a right-handed orthonormal basis.
• Add elapsed time queries to the second assignment of EDAN35, allowing to measure the time taken by the different passes.

Breaking changes

• bonobo::createProgram() takes shader files relative to the “shaders/” folder.

Improvements

• Switch away from Travis CI and AppVeyor, and use GitHub Actions instead.
• Add a more detailed build guide.
• Avoid loading unused materials in bonobo::loadObjects()
• Several performance and code improvements in the second assignment of EDAN35.
• Various improvements to the InputHandler class, included a rework of the modifier handling that should fix some issues.
• Label shader programs to help with debugging.
• Remove duplicated shaders.

Fixes

• Fixed typos.
• Fix the rendering of shadow maps in the second assignment of EDAN35.
• Dereference a CMake variable before using it in a generator expression.

Removal

• Drop GLStateInspection and GLStateInspectionView; debuggers provide more details than those and at a finer granularity.

Dependencies updates

• Update Dear ImGui to 1.84.2.
• Update the referenced commits for stb.
• Update the referenced commits for tinyfiledialogs.