Red-Green colourblindness mode

[Hubcapp]

https://en.wikipedia.org/wiki/Color_blindness
8% of all males and 0.5% of all females are red-green colourblind. This is actually a huge amount of people. Playing RSC as a colourblind person I would imagine is currently a frustrating thing, since several of the UI elements in the RSC client were not designed with colourblindness in mind.

We should support user-configurable colours for both "bad" and "good" which would apply in the following situations:

UI elements where the information is given ONLY by the colour (very important)

Health Bars

Quest List

Friends List (online-offline)

UI elements where the Red-Green colour is used as an indicator in addition to textual information

Level hardness rating

Whether or not you have the runes to cast the spell

Game options toggles

[Hubcapp]

Labelling as a bug, since this issue could make sections of the game unusable for some people until it is fixed.

[Hubcapp]

Possibly we would want to just hook the colour conversion for color codes, plus the health bar.
@red@ @gre@ @gr1@ @gr2@ @gr3@ @or1@ @or2@ @or3@ would all have custom colours (and may as well hook all of them for good measure?)

and there's a hook to do here too for the health bar:
https://bitbucket.org/eggsampler/rsc/src/bca75cc4bd27fd5d2460d5ae4ffc4484253da21f/233/src/client.java#lines-6443