Update symbols.dic with fullwidth punctuation symbols (#16299)
Closes #16288
Summary of the issue:
Some fullwidth punctuation symbols are not reported when exploring a default regex present in NVDA's own GUI.
Description of user facing changes
The following symbols are reported when navigating character by character or or read at high enough levels of symbol reporting:
．！？：；
The way they are reported is now customizable in the symbols dialog.
Description of development approach
Added these symbols in the English symbols file with the following parameters:
name: used the Unicode name; no need to use another shorter name since these symbols are not common in English
level: same as their western counterpart
repetition: same as their western counterpart
These symbols will then be added in other languages symbols files by translators.
For languages commonly using these symbols (e.g. Chinese), translators may find more suitable to use the level / repetition of the western "sentence end" corresponding symbol. E.g. use level / repetition of ". sentence ending" for "dot" instead of "dot" for "fullwidth full stop".
