Added syntax for code block & grouped all code related settings under…

[Nespelem-3000]

Added the ability to customize code block colors via the theme settings/
Also grouped all code-colors related settings under one heading 'In The Shadows Settings' > 'Code Blocks'

[Nespelem-3000]

If having these settings active you could give a try to the Railgun Pale color scheme for code blocks (by be5invis). The scheme is rather neutral, minimalistic and eye saving.

Settings > Style Settings > In The Shadows Settings > Import (paste the following):
{ "ITS@@code-text@@dark": "#C7B48B", "ITS@@code-comment@@dark": "#555555", "ITS@@code-function@@dark": "#C7B48B", "ITS@@code-keyword@@dark": "#FFC62F", "ITS@@code-property@@dark": "#C7B48B", "ITS@@code-punctuation@@dark": "#7F7F7F", "ITS@@code-string@@dark": "#B58913", "ITS@@code-tag@@dark": "#C7B48B", "ITS@@code-value@@dark": "#BF7E06" }