Losslessly compress png images with https://github.com/subzey/zopfli-png and then with PNGGauntlet.
Compilation.txt: update GCC pack link
astyle: specify --close-templates
Make "Sharpen Complex 2" shader compatible with Pixel Shader 2.0.
Add the ability to close a media instead of pausing/stopping at the EOF.
Audio Switcher: Improve normalization process.

Use a much better regain strategy (similar to ffdshow's) and fix the regain rate being completely exponential rather than linear.

This commit fixes #1936.
Audio switcher: Use percentage instead of dB for the boost.

Internally a percentage was already used and it is much easier for the user to understand a boost expressed in percentage.
Output normalization factor just for tests.