Fixed segfault when checking libusbx (daca2)
astyle formatting

[ci skip]
Refactorization: Use SymbolDatabase to find functions in CheckUnusedFunctions
Refactorized detection of function usage in CheckUnusedFunction, fixed #5358
Ran dmake.
Regression test for #5061.
Updated manual according to #5087
Fixed false positive "unused function" #5113.