Minor Bugfixes, Language enhancements, Support for Mikrotik RouterOS and R

• Added: keyword k11 for annotations
• Added: keyword x16 for css element selectors
• Added: contextual keywords to csharp - thanks to mabako on GitHub
• Added: kotlin string template support
• Added: r language support (covered by generic ruleset)
• Added: MikroTik RouterOS language support (ros/mikrotik/switchos/routeros/mt)
• Added: pound style comment support to php
• Changed: css selector fragment highlighting is limited to the selector itself
• Changed: enhanced css unit parsing
• Changed: java, scala, cpp annotation token changed to k11
• Changed: added token k11 to themes
• Changed: moved generic highlighting rules to lang/rulesets/generic
• Changed: ampersandCleanup is performed after html escape sequences to eliminate issues related to double unquoting #109
• Changed: toggle raw code label to "Plain text"
• Changed: allowed utf8 characters in php variable and function names (side effect of the php parser)
• Bugfix: vhdl single bit highlighting collided with attribute syntax - thanks to tyriun on GitHub
• Bugfix: css classnames/ids with hyphens were not recognized
• Bugfix: XML mixins of single/double quotes in attributes failed #108
• Bugfix: dot char within XML attribute names not recognized
• Bugfix: kotlin raw string where not correctly parsed (wrong rule priority)
• Bugfix: highlighting color of classic theme not applied due to invalid selectors - thanks to woolseyj on GitHub