Issue with .db directive parsing strings containing single quotes

[dylanh333]

avra appears to have a strange bug when parsing strings in .db expression lists, where:
(1) if that expression list contains a string enclosed in double-quotes, and
(2) that string contains a single quote anywhere inside, then
all subsequent expressions in the list (after the string) are ignored and are not emitted in the assembled hex file.

This means that you potentially lose any line-feeds, null terminators, etc. from the end of the .db expression list.
The string that contains the single quote, however, is still emitted in its entirety.

I've tested this using the latest build of avra from the master branch, as of the 1st of September 2024 (1.4.2), and also on 1.3.0 Build 1 (from the Ubuntu 22.04.4 LTS repos).

Please see the example below:

.org 0xb
; Incorrectly only outputs "It's broken", with a \0 appended to pad it to the next word
str_broken: .db "It's broken", "!", 0x0a, 0

; For readability in hexdump
str_delim1: .db "---", 0

; Correctly outputs "It's broken!\n\0"
str_workaround: .db "It", 0x27, "s broken", "!", 0x0a, 0

; For readability in hexdump
str_delim2: .db "---", 0