simulator: add optional listName to config.lua

[XeduR]

This allows users to define listName property inside config.lua's application table.

Missing or malformed config.lua is handled gracefully. If listName property is not defined, then Simulator falls back on default behaviour, i.e. this will not affect any existing projects. Projects will need to add application.listName to their config.lua to see any changes.

This change only affects the display texts in the Simulator's Recent Projects. This change does not affect the build process or anything else.

Current behaviour

Solar2D Simulator picks the project's display name based on the folder where the project's main.lua file is located. This can result in non-descriptive and even duplicate project names in the list.

New behaviour

Insert listName (string) to config.lua and the project's name changes in the Simulator's Recent Projects list. This allows developers to control exactly how their projects appear in the list.

config.lua:

application =
{
	listName = "Solar2D Playground",

	content =
	{
		width = 640,
		height = 960,
		scale = "letterbox",
		fps = 60,
	},
}