initialRows/initialCols should respect the first launched profile in a window, rather than the default

Current behavior

Currently, the --size command uses the font of the default profile to calculate window size, which results in a different size when opening another profile with a different font setting.

Proposed change

Add a new Default launch size field to profile settings. If only one profile is requested at launch, use the size from the new field (--size overrides it) with the font settings of the specified profile. If multiple profiles is requested, use the current behavior.

Why do I need this feature

This is important for my workflow as I need to open an instance with many small cells instead of a few big cells. Changing from the settings page is slow and ruins the default settings.