* rebasing on master to implement --followcalls
* in progress changes to enable --followcalls
* rebase to master: modified function to add children to funcs array
* modify main traversal loop
* added tests to check different scenarios
* added tests to check different scenarios
* added tests to check different scenarios
* add test to check for overlapping regular expression
* modified type of strings array as a return only
* changed depth to a simple integer instead of a global map
* avoid calling traverse on recursive calls
* Added tests for various call graphs to test trace followfuncs
* Added tests for various call graphs to test trace followfuncs
* Added tests for various call graphs to test trace followfuncs
* made auxillary changes for build to go through for new option follow-calls
* Add support to print depth of the function calls as well
* Added two sample output files for checking
* Bypass morestack_noctxt in output for verification testing
* Corrected newline error by adding newlines only if the line does not match morestack_noctxt
* Added more tests
* Cleanup
* Updated documentation
* fixed error message in fmt.Errorf
* Fixed result of Errorf not used error
* Addressing review comments to fix depth reporting and other issues
* dont invoke stacktrace if tracefollowcalls is enabled, compute depth from main regex root symbol than main.main
* Addressing a part of review comments
* Added changes to allow deferred functions to be picked up for tracing
* Fix issue to avoid printing stack for a simple trace option
* Moving most tests to integration2_test.go and keeping only one in dlv_test.go
* Moving most tests to integration2_test.go and keeping only one in dlv_test.go
* Adding panic-defer test case
* Moved rest of the tests to integration2_test.go
* addressing review comments: folding Functions and FunctionsDeep, reducing branches by using depth prefix, wrap using %w and other comments
* Optimize traversal and parts of printing trace point function and modify trace output layout
and adjust tests accordingly
* Resolved error occurring due to staticcheck
* Implemented traversal algorithm using breadth first search
* Addressing review comments on the breadth first search implementation and
other comments
* Inline filterRuntimeFuncs and remove duplicate initialization
