* in addition: add unloadable sourcegroup to visualize, load and save information when loading a project that contains source groups that are not supported by the build
* Added new Source Group type SourceGroupCustomCommand to UI and ProjectSettings
* The Source Group executes a specified command on every source file
* The variables $SOURCE_PATH, $PROJECT_PATH, $DB_PATH, $STORAGE_VERSION can be passed
* The commands are executed after all other source groups finished indexing
* The command is executed with working directory set to project directory
* Errors during command execution are shown as status update and in the Status View
* SourceGroupCustomCommand cannot be partially cleared, when one file needs clearing the project must be fully re-indexed
* removed paths in include directives
* changed cmake to provide necessary header search paths
* changed name of version.h to productVersion.h due to name conflict
* pass log directory absolute to indexers
* pass app and user paths absolute to indexers
* removed QCoreApplication instance from indexer process
* removed mutex from ConsoleLogger
* updated shortcut window
* renamed code reference menu items
* used wstring in FilePath constructor where easily possible
* added FilePath concatenate method that accepts string parameter
* implemented using only wstring in MessageStatus
* used wstring in config
* some parts of the indexer were called "manual" while others used the
name "empty". renamed everything that was called "manual" to "empty"
to conform to names in GUI
* disable windows error dialogs on application crash for indexer target
* show indexing dialog at the start of indexing task instead of waiting for processes to start
* fix escaping path to binary for indexer process
* join garbagecollector thread when stopping
* fix compile errors related to FilePath in deploy mode on windows
* TaskBuildIndex starts seperate indexer processes and communicates via shared memory
* indexer processes get restarted if they fail
* indexer processes are killed when the app closes or crashes
* added utility class SharedMemory to allocate and access shared memory, providing basic data structures
* added SharedMemoryGarbageCollector for keeping track of running instances and cleaning up shared memory in case of a crash
* show errors for source files that crashed during indexing
* added basic exception handling to task scheduling
* added option to turn off processes and use threads in preferences, but still use shared memory
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