initial issue description mentions "per-profile", but consider that they could be commandline arguments

Description of the new feature/enhancement

i want to create multiple shortcuts that launch wt at different sizes and screen positions. i'm talking about multiple instances of wt, not multiple tabs within wt.

however, the initialPosition setting is global and cannot be overridden on a per-profile basis. ditto for initialRows, initialCols and launchMode. because these are global settings, any shortcut can only launch wt at one position and size.

i'm looking for parity with CMD here. a shortcut to CMD has a bunch of settings tabs, including screen size and position. i have shortcuts to launch CMD in different places for various reasons. i'd like to use shortcuts to launch wt instead.

Proposed technical implementation details (optional)

allow initialPosition, initialRows, initialCols and launchMode to be specified within a profile in settings.json. if that profile is the main one active at launch time, then use them instead of the globals.