PowerRename: Add Lookbehind (#7571)

* Add boost-regex library

* If enabled use boost lib for regex

Add property `_useBoostLib` to `CPowerRenameRegEx`. If enabled for
replacements with regular expressions the Boost Library is used instead
of the Standard Library.

* Extend signatures to create RegEx with Boost

Extend create and constructor singatures of `CPowerRenameRegEx` with an
option to enable (or disabled, which is default) the Boost Library.

* Verify Lookbehind fails with STD library

To verify that the boost library is disabled as expected, check if a
lookbehind fails.

* Add Unit tests for RegEx with Boost

Add unit tests to verify regex replacement with Boost Library. They are
copied and adapted from the Standard Library tests.

* Improve verify capturing groups test with Boost

It is possible to use a capturing group followed by numbers as
replacement if the group number is enclosed in curly braces.
Added test cases based on the Standard Library tests.

* Add useBoostLib to settings interface

* Get library option from settings object

* Reduce signatures of RegEx by "useBoost"

Remove the parameter added in 19105cf, as it became obsolete.

* Settings: Read useBoostLib from JSON file

* Add UseBoostLib Option to UI

* Boost Lib label states the regex syntax difference

* Fix Regex with Boost Lib tests

- Do not load settings another time in CPowerRenameRegEx ctor
- Set flag correctly in standard library regex tests

* Add "lookbehind" to dictionary

* change Library to lowercase, and also add a comment

As suggested by @enricogior.

Co-authored-by: Enrico Giordani <enricogior@users.noreply.github.com>

* Change Library to lowercase and add a comment

 As suggested by @enricogior.

Co-authored-by: Enrico Giordani <enricogior@users.noreply.github.com>

src/modules/powerrename/lib/Settings.h

@@ -51,6 +51,16 @@ public:
         settings.persistState = persistState;
     }
 
+    inline bool GetUseBoostLib() const
+    {
+        return settings.useBoostLib;
+    }
+
+    inline void SetUseBoostLib(bool useBoostLib)
+    {
+        settings.useBoostLib = useBoostLib;
+    }
+
     inline bool GetMRUEnabled() const
     {
         return settings.MRUEnabled;
@@ -114,6 +124,7 @@ private:
         bool showIconOnMenu{ true };
         bool extendedContextMenuOnly{ false }; // Disabled by default.
         bool persistState{ true };
+        bool useBoostLib{ false }; // Disabled by default.
         bool MRUEnabled{ true };
         unsigned int maxMRUSize{ 10 };
         unsigned int flags{ 0 };