Partial linking of spec segments (#2661)

* Partial linking of overlay segments, relax linker script alignment

* Partial linking of all spec segments

* Fix update, remove _RomPos from linker script

* iQue version working pending COM-plugin update

* Add plf map file resolution to sym_info.py, local symbol merging is broken

* git subrepo pull tools/com-plugin

subrepo:
  subdir:   "tools/com-plugin"
  merged:   "c4f3ba845"
upstream:
  origin:   "git@github.com:Thar0/com-plugin.git"
  branch:   "main"
  commit:   "c4f3ba845"
git-subrepo:
  version:  "0.4.6"
  origin:   "https://github.com/ingydotnet/git-subrepo"
  commit:   "110b9eb"

* Make tools compatible with partial linking

Co-authored-by: Anghelo Carvajal <angheloalf95@gmail.com>

* Remove unused files

* Fix some makefile bits

* mkspecrules cleanup

* Comment on the makerom linker layout in mkldscript

* Revert linker padding strategy back to pad_text spec directives

* Comment on objcopy elf -> rom step

* Adjust tool descriptions

* Fix compressed builds

* rm reloc_prereq, no longer used

* Makefile merge fix

Co-authored-by: Dragorn421 <Dragorn421@users.noreply.github.com>

---------

Co-authored-by: Anghelo Carvajal <angheloalf95@gmail.com>
Co-authored-by: Dragorn421 <Dragorn421@users.noreply.github.com>

tools/com-plugin/README.md

@@ -10,6 +10,8 @@ The plugin expects a symbol order txt file listing the COMMON symbols in order o
 
 Add `-plugin common-plugin.so -plugin-opt order=bss_order.txt` to the linker invocation, replacing `bss_order.txt` with an alternative path if desired.
 
+An optional argument `-plugin-opt min_align=N` can specify the minimum alignment for the bss output files. If unset, the minimum alignment is 0: the resulting section alignment is equal to the minimum alignment required by the symbols.
+
 Also add any bss output files mentioned in the order file to the linker script (e.g. `bss.o` would be added as `*bss.o(.bss*)`) so that the additional input file is not discarded, if required.
 
 ### **Symbol order file syntax**