Float-Ditherer 0.9.0 Update

For the update 0.9.0 there are a few major changes most importantly the Domain-specific Language for custom luminance formula and documentation

Change Log:

• Improved Stability and Performance when merging
• TIF Export
• Image Histogram & Histogram export
• Crash Handler
• Custom Luminance Formula & DSL
• New Quick reference sheet

Quick Copy Codes are Compatible From Old --> New