Gold linker, CCache, Stats, LGTM

- Increases linker performance under Linux builds by using Gold linker, if available
- ccache is used if available
- removed statistic class (Stats.cpp) from project due to the missing result (sorry @Brindosch)
- add LGTM bandges for code analysis overview

Signed-off-by: Paulchen-Panther <Paulchen-Panter@protonmail.com>

effects/waves.py

@@ -39,7 +39,7 @@ diag = int(diag*1.3)
 # calc positions
 pos = 0
 step = int(255/len(colors))
-for entry in colors:
+for _ in colors:
 	positions.append(pos)
 	pos += step