Bug fixes

Been a while! Just wanted to get some bug fixes and tweaks in for this plugin. This gets things in better parity with some things I learned while implementing B.Map!

* Fix sub-pixel sampling offsets that were occurring when using nearest-sampling

* Fixed a sampling issue that would occur when the UV-Layer and the Sampled texture-layer have different resolutions

* Fixed an issue where texture-samples were being flipped-again with certain combinations of wrapping modes and scales