Add help-console command to Qt debug console
- Added help-console to the list of autocompletion strings
- Implemented requested changes to help message:
- Added an example that uses access-by-index getblock(getblockhash(0) true)[tx]
- Replace "bracketed syntax" to "parenthesized syntax" where applicable
- Replace "separate" with "delimit"
- Removed <br> and <b>help/help-console</b> from translation strings, since these parts don't change between languages
- Changed examples to be based off getblock 0 so they will work even with pruned/no blockchain and disablewallet if copied and pasted
- Clarified syntax for queries of named/unnamed result objects.
Backport of Core PR #11698
Co-authored-by: Jason B. Cox <email@example.com>
Test Plan: ninja check
Reviewers: deadalnix, schancel, #bitcoin_abc
Reviewed By: deadalnix, schancel, #bitcoin_abc
Differential Revision: https://reviews.bitcoinabc.org/D1938