FR: Add option to set the opacity of lines drawn using DrawTools

[RickyGrassmuck]

As someone that doesn't do well with low contrast colors, being able to reduce the opacity of drawn lines would make it easier to have the planned links stand out when they overlap Res/Enl fields as well as when using dark map tiles (0.5 opacity makes a whole range of colors essentially unusable).

I just started getting acquainted with the code base and may make a pass at adding this if someone more familiar with the project doesn't tackle it.

Example screenshot showing how low the contrast is for drawn lines vs. rendered links/fields.

[McBen]

Is it an option to simply enhance the colorpicker by an alpha value control?

AFAIK the used jQueryUI Spectrum already supports alpha channel.

[McBen]

Is it an option to simply enhance the colorpicker by an alpha value control?

No. bad idea.
That would set all old script to opacity off because of default values.

Better create an addtional 'colorblindness' (or similar) plugin.