* set unrestricted permissions on shared memory allocation to fix crash on Windows
* log exceptions during shared memory creation and destruction
* create SharedMemoryGarbageCollector after logging was enabled
* holding down back or forward button shows list of current back-forward stack
* added narrow button between back and forward to show the list
* added History menu
* moved back and forward actions to History menu
* show chronological list of recently active symbols in History menu
bug id = 151
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* 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
* increased spacing around graph
* fixed graph lagging on message focus out
* fixed level assignment fails
* fixed dead ends in cyclic graph removal
* improved node positioning by grouping to same average position
* fixed graph image export not centering graph
* fixed black dot at graph origin
* show status updates while creating trails
* 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
returning a bool seem to cause a seg fault on the linux 64 bit builder
since it is not used anyway i changed it back to the void return.
(dont know why it is a seg fault)