refactor(Utils/FileLoader): improve and simplify code
refactor(Utils/FileLoader): improve and simplify code

* refactor(Utils/FileLoader): use simple DirectoryIterator instead of recursive

it's not necessary to use the recursive class since we're only going
through a single level / a single directory

* refactor(Utils/FileLoader): use single function to load php files

added documentation for the function, removed some unnecessary code

* fix(Utils/FileLoader): add trimming of slashes in paths

flyntwp/flynt-starter-theme,flyntwp/flynt-starter-theme,flyntwp/flynt-starter-theme