Nwokoma Uchechukwu

Added ability to set base path(s) through plugin constructor

2

This makes it easy for users that are not using the default path to specify their own customized path.

Two issues are currently encountered when building Urho3D for Web on Windows. 1. While setting up a build by directly or indirectly calling [script\cmake_generic.bat](https://github.com/u3d-community/U3D/blob/master/script/cmake_generic.bat), an infinite loop will occur when...