[Feature] Language-specific visual selections

[MisanthropicBit]

Currently, it is possible to visually select only numbers in the general sense but not numbers specific to a programming language. For example, Python allows 78. as a short-hand for 78.0 and _ as a separator in e.g. 0b1_00_11_01. C++ has specific literal suffixes such as unsigned long long l2 = 18'446'744'073'709'550'592llu; and use ' as a separator.

Current progress is happening on the proglang-numbers branch. The present implementation detects the filetype and sets buffer-local stuff that is tried (if present for the current buffer) before trying to visually select a general number.