Optimize class loding calls
Optimize class loding calls

If caseSensitiveClassLoading is false, $this->composerClassLoader->loadClass() is called twice,
even if the class to be loaded has correct casing.
Remove this overhead by trying to load a class in the beginning and directly return if
this was successful.

Fixes #2

TYPO3/class-alias-loader,helhum/class-alias-loader,bwaidelich/class-alias-loader,mbrodala/class-alias-loader