CMake code completion: Add missing chars to be escaped
Summary:
List of chars to be escaped is taken from: https://cmake.org/Wiki/CMake/Language_Syntax
To use literally any of "()#$^, escape the character with a backslash
Test Plan: created a file foo"()#$^.cpp, the chars are escaped properly.
Reviewers: KDevelop, kfunk
Reviewed By: KDevelop, kfunk
Subscribers: kdevelop-devel
Differential Revision: https://phabricator.kde.org/D6689
CCBUG: 338196