Make Latex completion in strings
Fixes space completion in paths in the REPL like: cd C:\\Program\ Files\\
Add some more release-candidate steps

from PR #8758, removed item 9 which is not applicable to release branch
(cherry picked from commit 3dbe554c9b077fadbdd5457bc7f1467de113d6be)

Conflicts:
	Makefile
make curl flags more robust in msys_build.sh

use https://status.julialang.org

set MARCH on appveyor

(cherry picked from commit ce29d785098564b61af0c65113595b1af7ba0acb)

[ci skip] since this is expected to fail on win32 right now due to #9185
improve/fix windows backtraces and win64 memory over-consumption issue

cherry-pick of 'Merge pull request #9190 from JuliaLang/jn/win32_backtraces'
Fix #9146 by changing signature in umferror from Int to Integer
Forcefully add files in `Pkg.generate`

Makes the generation more robust and avoids potential clashes with any
global `.gitignore`.

ref: #9193
(cherry picked from commit 847c134f8667b8637d4d8ccf5dd8eb6f74288a4e)
Merge pull request #9164 from dhoegh/Backport_space_in_path_completion

Backport of #8838 and #9143 squashed
Merge pull request #9165 from dhoegh/Backport_latex_completion_strings

Backport of #8989 and #9137 squashed.