Shelex parser shortcomings

New line handling: https://canary.discord.com/channels/574921006817476608/880982021852254270/942171909926309929
Quote behaviour: https://canary.discord.com/channels/574921006817476608/880982021852254270/936460905225551933
Losing track of actual spacing:  https://canary.discord.com/channels/574921006817476608/880982021852254270/942064615662182460 (this ties in with the new line handling)