upcoming corelib changes with the new buffer

[jerch]

Tracking issue to get outstanding core lib changes sorted:

• typed array parser support (PR support typed array in parser #1796)
• apply UTF32 layout with true color support to terminal buffer (PR Utf32 buffer #1878)
• cleanup intermediate CharData creation (part of PR Utf32 buffer #1878)
  Idea is to move from the CharData based cell access to a more direct data access on the typed array. For convenience the CharData part could live on, but at least high throughput/runtime consumers (renderer and such) should be able to access the data in a faster more direct approach.
• true color support (see Terminal does not render true color  #484, PR True color support #1895)
  This needs some tweaks/refinement of the current attribute handling and will basically introduce a second 32bit value to be carried around.
• convert string based methods in InputHandler into typed array (covered by cleanup/enhancement of parser #1823)
  This will save forth and back conversion of charcodes needed by the parser to "speak" with the string based API. (finally done by Parser hooks #2346).
• fix the fullwidth problems in InputHandler (seperately tracked Better handling of fullwidth chars #1779)
• eval other input encodings
  In the future we might want to check, if we can gain anything from other input encodings (hottest candidate is UTF8, PR Utf8 input #1904).
• parser cleanup, support for colon notation (see cleanup/enhancement of parser #1823)

[jerch]

Closing this issue since most things are done. The open things are covered by other issues and will be addressed there.