For large documents with lots of problems, switching the file
has a noticeable delay, caused by computing lots of size hints.
We can avoid that by using a heuristics instead.

This commit fixes the following compilation errors:
..\kdevplatform\util\environmentprofilelist.cpp(260): error C3493:
  'escapeChar' cannot be implicitly captured because no default capture mode has been specified
..\kdevplatform\util\environmentprofilelist.cpp(260): error C3493:
  'variableStartChar' cannot be implicitly captured because no default capture mode has been specified
..\kdevplatform\util\environmentprofilelist.cpp(273): error C2064:
  term does not evaluate to a function taking 1 arguments
<plus most likely similar errors in kdevplatform/util/kdevstringhandler.cpp>

The Microsoft Solution for the relevant bug report
https://developercommunity.visualstudio.com/content/problem/610504/lambda-fails-to-implicitly-capture-constexpr-value.html
reads: "It had been fixed with /experimental:newLambdaProcessor."

I don't suppose enabling experimental flags when building KDevelop is a
good idea. Let us work this compiler bug around instead: specify the
default capture mode as `=`.

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* eliminate QRegularExpression;
* disallow variable names starting with a digit as they are unsupported
  by most POSIX shells;
* add support for braced variables: ${VAR}.

Before this change expandVariable() transformed "\\\\$var2" into "$var2"
instead of expanding $var2 even though it replaced "\\\\" with "\\" in
other cases.

Add more expandVariables() tests.

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Prevents UBSAN warning:
```
plugins/clang/codegen/adaptsignatureaction.h:32:8:
runtime error: load of value 139, which is not a valid value for type 'bool'
```

Fixes linker error when building with ASAN enabled, as CTestSuite
wasn't available in test_ctestfindsuites otherwise.

Fixes linker error when building with ASAN enabled.

Putting it into the static library yields a linker error when
compiling with ASAN enabled.

Skip the trailing comma, otherwise the document for the trailing
identifier fails to parse successfully as it would then start
with the trailing comma.

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(cherry picked from commit 81b4cb06)

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(cherry picked from commit a8eee049)

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(cherry picked from commit d88747f0)

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(cherry picked from commit 193c9cc9)

KPageView changed behaviour in KF 5.65, no longer enforces a 0 margin
around pages itself, so we have to do it explicitly.

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