Add to API: Localized Adjustments brush parameters

In the LrDevelopController namespace, add to Localized Adjustments brush parameters: 

1. Size 
2. Feather 
3. Flow 
4. Density

So that those parameters can be used in the following LrDevelopController calls:

• getRange
• getValue
• increment
• resetToDefault
• revealPanel

Currently have:

•  "local_Temperature"
•  "local_Tint"
•  "local_Exposure"
•  "local_Contrast"
•  "local_Highlights"
•  "local_Shadows"
•  "local_Clarity"
•  "local_Saturation"
•  "local_Sharpness"
•  "local_LuminanceNoise"
•  "local_Moire"
•  "local_Defringe"
•  "local_Blacks"
•  "local_Whites"

This would allow users to manipulate brush parameters through a plugin just as they can already manipulate the other localized adjustment parameters. This is a common request from my plugin's users. (My plugin allows users to manipulate Lightroom through MIDI control surface knobs and switches).