Add property-based filtering (`-filter` keyword arg) on all SDC `get_*` commands (+ DRY refactor)

[akashlevy]

Creating a draft PR for this. Basic goal is to add -filter to all SDC get_* commands to match the behavior of commercial STA tools. I'll be following DRY principle as much as possible in my commits.

Need some input: how to deal with error codes? There's no room to squeeze in new codes, so right now I'm adding new ones by adding 2000 to the previous error code. Not sure if you have a preferred way of adding new codes into the mix. Another option is to remove some codes and have the filter_objs function have a single error code no matter which object type is being filtered.

Tasks:

• [x] Add generic filter_objs TCL function
• [x] Remove global filter_* regexp variables and instead move these inside of filter_objs
• [x] Refactor -filter for get_cells
  • [x] Use filter_objs
  • [x] Delete filter_insts1
• [x] Add -filter to get_clocks
  • [x] TCL: Add [-filter expr] to header
  • [x] TCL: Add -filter to key flag parsing
  • [x] TCL: Add filter handling in body
  • [x] SWIG: Add filter_clocks function
  • [x] SWIG: Add relevant datatypes (in ClockSeq *)
• [x] Add -filter to get_lib_cells
  • [x] TCL: Add [-filter expr] to header
  • [x] TCL: Add -filter to key flag parsing
  • [x] TCL: Add filter handling in body
  • [x] SWIG: Add filter_lib_cells function
  • [x] SWIG: Add relevant datatypes (in LibertyCellSeq *)
• [x] Add -filter to get_lib_pins
  • [x] TCL: Add [-filter expr] to header
  • [x] TCL: Add -filter to key flag parsing
  • [x] TCL: Add filter handling in body
  • [x] SWIG: Add filter_lib_cells function
  • [x] SWIG: Add relevant datatypes (in LibertyPortSeq *)
• [x] Add -filter to get_libs
  • [x] TCL: Add [-filter expr] to header
  • [x] TCL: Add -filter to key flag parsing
  • [x] TCL: Add filter handling in body
  • [x] SWIG: Add filter_liberty_libraries function
  • [x] SWIG: Add relevant datatypes (out LibertyLibrarySeq, in LibertyLibrarySeq *)
• [x] Add -filter to get_nets
  • [x] TCL: Add [-filter expr] to header
  • [x] TCL: Add -filter to key flag parsing
  • [x] TCL: Add filter handling in body
  • [x] SWIG: Add filter_nets function
  • [x] SWIG: Add relevant datatypes (in NetSeq *)
• [x] Refactor -filter for get_pins
  • [x] Use filter_objs
  • [x] Delete filter_pins1
• [x] Refactor -filter for get_ports
  • [x] Use filter_objs
  • [x] Delete filter_ports1
• [x] Refactor -filter for get_timing_edges
  • [x] Use filter_objs
  • [x] Delete filter_timing_arcs1
• [x] Add some simple tests for -filter flag with asap7 collateral
  • [x] get_cells
  • [x] get_clocks
  • [x] get_lib_cells
  • [x] get_lib_pins
  • [x] get_libs
  • [x] get_nets
  • [x] get_pins
  • [x] get_ports
• [x] Update docs to include newly-added -filter flags
  • [x] get_clocks
  • [x] get_lib_cells
  • [x] get_lib_pins
  • [x] get_libs
  • [x] get_nets
• [x] Update error code numbers
  • [x] Update Sdc.tcl
  • [x] Update messages.txt

[akashlevy]

All right, ready for review. Please let me know how to proceed regarding the error codes.

[akashlevy]

All revisions made. Also added error codes into messages.txt, let me know if it's ok

[akashlevy]

I updated your recently-added etc/FindMessages.tcl to support the filter_objs TCL expressions