remove /x32 /x64 decorators from offset and number features

[williballenthin]

as discussed in #930, we have a better way to specify bitness logic (e.g. number/x32: ...) today:

- and:
  - arch: i386
  - offset: 0x10

while its a bit more verbose, its consistent with os, format, etc. features.

removing these flavors will reduce the amount of code we have to maintain (that threads bitness throughout feature sets).

it will also reduce the number of features we extract. for example, when considering mimikatz.exe, the vivisect backend extracts 322,647 total features, of which 49,206 (15%) are bitness flavored numbers and offsets.

[williballenthin]

this will be a breaking change

[williballenthin]

Here are the rules where we currently use these features:

❯ rg "(offset|number)/x" -l
linking/runtime-linking/access-peb-ldr_data.yml
linking/runtime-linking/get-ntdll-base-address.yml
linking/runtime-linking/get-kernel32-base-address.yml
nursery/log-keystrokes-via-raw-input-data.yml
communication/socket/tcp/send/obtain-transmitpackets-callback-function-via-wsaioctl.yml
host-interaction/hardware/cpu/get-number-of-processors.yml
host-interaction/process/create/create-a-process-with-modified-io-handles-and-window.yml
host-interaction/process/get-process-heap-force-flags.yml
host-interaction/process/get-process-heap-flags.yml
lib/peb-access.yml
anti-analysis/anti-forensic/patch-process-command-line.yml
anti-analysis/anti-debugging/debugger-detection/check-for-peb-ntglobalflag-flag.yml
load-code/pe/enumerate-pe-sections.yml
load-code/pe/rebuild-import-table.yml
load-code/pe/parse-pe-header.yml

[williballenthin]

during meeting, @mr-tz and @mike-hunhoff agreed that this should be removed.