Problem:
On Windows, path separators may become inconsistent for various reasons,
which makes normalization quite painful.
Solution:
Normalize paths to `/` at the entry boundaries and always use it
internally, converting back only in rare cases where `\` is really
needed (e.g. cmd.exe/bat scripts?).
This is the first commit in a series of incremental steps.
Note:
* some funcs won't respect shellslash. e.g. `expand/fnamemodify`
* some funcs still respect shellslash, but will be updated in a follow
PR. e.g. `ex_pwd/f_chdir/f_getcwd`
* uv's built-in funcs always return `\`. e.g. `uv.cwd/uv.exepath`
Co-authored-by: Justin M. Keyes <justinkz@gmail.com>
Problem: tests: tests may fail on Windows environment
Solution: use shellcmdflag=/D to skip executing autorun from
the registry (Milly)
closes: vim/vim#159004f5681dbdf
Cherry-pick Test_cursorhold_insert_with_timer_interrupt() change from
patch 8.2.1836.
Co-authored-by: Milly <milly.ca@gmail.com>
