compression was over and then destructed

colliding with valid not-yet-defined CSR numbers
Add CSR definitions from v1.12 RISC-V privileged spec

Add stfpython wrapper script that automatically sets up PYTHONPATH to
point to the correct installed version of stfpy

Fix segfault in STFReader::close

    - Use delegate classes to modify private members to encapsulate
    things and keep other users from accidentally changing anything
Add STFUserModeSkippingReader to make non-user mode skipping generic
Add non-user mode skipping to STFBranchReader

Add STFBranchReader
    - Reads branch instructions from a trace, returning STFBranch
    objects
    - ~2.5x faster than STFInstReader
    - Inherits from STFBufferedReader
Refactor STFInstReader
    - Now inherits from STFBufferedReader that handles circular
    buffering, other common buffered reader tasks
    - Put filter classes in their own header
Add std::ios flag support to stf_assert
Add bit extraction utilities to util.hpp

Add better error checking for compressed STF headers

still support RV64 traces with 32-bit EventRecords

Fixes #8

Change stf_linker_setup to a function
    - Function will only run once per scope

Move linker setup (LTO, etc.) to a separate CMake include so that other
projects can include it as well

    - Detects dirty/clean state
    - Will only trigger a new build if SHA or dirty/clean state has
    changed

determining if they are vector instructions
    - Needed to handle the case where VL == 0, since vector load/store
    instructions won't have records for their normal vector operands

versions

  Major changes:
    - Add support for single-threaded decompression to reduce memory usage
    - Add vector support

  Minor changes:
    - Bump STF library version to 1.4
    - Make STFReaderWriterBase move assignable/constructable
    - Allow comment records anywhere in the trace
    - Allow process ID records in the header
    - Add STFInst::write method that filters out specified record types
    - Fix typo in error message
    - Add std::initializer_list constructor for InstRegRecord
    - Fix print_utils to match new disassembler interface
    - Remove print_utils::printOpcodeWithDisassembly since it isn't used outside of stf_dump
    - Add generator definitions for Athena and stf_morph
    - Remove STF_TOOL_VERSION
    - Add convenience methods for getting latest TraceInfoRecord from a reader and checking
      whether a TraceInfoRecord was created by a specific generator
    - Split STF_GEN enum into its own file(s)
    - Clean up Doxygen comments

  Bug fixes:
    - Clear STFRecordMap in copy assignment operator to fix memory leak in stf_check
    - Fix bug in constexpr log2 function
    - Fix record reuse bug caused by not always resizing data vector in InstRegRecord
    - STFCompressedIFstream: Fix race condition in destructor that caused a segfault if the
      second reader thread was still running at destruction time

where appropriate
    - Provides minor speedup in string formatting and I/O

    - Note that it's possible to invalidate other iterators by seeking
    too far

Fix race condition in STFCompressedOFStream that caused incorrect chunk PCs to be written to a compressed STF

Add error checking to STFIFstream::seek()

Fix STFInstReader::iterator class to properly handle case where we
have already attempted to fill the instruction buffer but no
instructions were read (iterator is set to end iterator in this case).

Upstream stf_lib changes

that the single-element optimization is handled properly
    - Fixes segfault in stf_dump when dumping PTEs

Fix segfault in STFInstReader when ignoring records
Flag faulting instructions in STFInstReader
Add vector register definitions and formatter
Fix assertion message in Registers::formatVector_
Add explicit copy assignment operator to STFRegState to fix compile errors on OSX
Fix duplicated EVENT_PC_TARGET records in stf_extract