* changed order of compiler flags for CDB indexer commands so that manually added flags are appended to the flags form the compile command.
* removed usage of clang::tooling::FixedCompilationDatabase and used CompilationDatabaseSingle for empty and cdb indexer commands.
* removed reference to a specific clang tool (e.g. "cl" or "cl.exe") from compile command and prepended "clang-tool" before running the indexer.
* 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
* added CanonicalFilePathCache to also reserve the initially recorded casing of file names
* use canonical file path cache to resolve filepaths in names of symbols (anonymous, static, ...)
* null reference fixes
* 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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* use canonical filepath cache in cxx indexer
* made constructors of FilePath explicit
* use FilePath at more places instead of string
* forward declares FilePath wherever possible
* replaced parser arguments by project specific IndexerCommands that know everything the indexer needs to know to do its job
* added different language and project specific indexers that know how to handle a certain kind of indexer command
* refactored FileManager and FileRegister to have less overhead
* removed no-rtti restriction for clang files in lib cxx
* uncommented deprecated interprocess code.
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