Improvements to exception handling and various clarifications

Added code fragments and associated data for on chip transport. Reverted green text to black. New changes are in cyan

Replaced remaining references to ended_upd with ended_ntr

Correct algorithm include

Added discovery details for data trace

Fixed definition of size width in data trace packet formats, and made atomics consistent with ordinary loads&stores

Corrected placement of context change with discontinuity on the algor…

Added note on push/pop and fixed various typos

Fixed typos:irstatus -> irreport

This commit is mainly some minor bug-fixes, and a few miscellaneous
minor changes. These changes are:

    * Initialize decoder->decoded_cache[] properly when PC == 0x0

    * Remove the "with_address" field from the te_inst_t structure.

    * Added a new predicate function te_is_with_address()

    * Added the prefix "i" to some identifiers, making it clear this
      identifier is specific to instruction trace.

    * Updated copyright information, assigning copyright to Siemens.

    * Added SPDX copyright and licence designators.

These files are intended as reference example implementations in C for
both the trace-encoder and the trace-decoder, providing the "heart"
of the respective algorithms.

Note: any existing code will need to modified when re-basing to use this
commit. To be clear, any extant code that initializes the "with_address"
field in the struct te_inst_t can simply be deleted. There is no need
do anything else, or write any new code.

Signed-off-by: Sean McGoogan <Sean_McGoogan@mentor.com>

Fixed typo in lastsize width (table 4.3)

Addition of simple assembly test that should generate example trace messages

cleaned up copyright notice.

Signed-off-by: Bill Mcspadden <bill.mcspadden@seagate.com>

interesting trace messages (per the RISCV Instruction Trace specification).

typo fix: itype -> dtype table reference

WARL and data trace replication clarifications

Data trace signals branch

ASID and VMID position recommendations and data trace packet clarific…