Implement all Scenegraph field types as types in BrighterScript [V1]

[markwpearce]

SceneGraph has a bunch of field types that could also be "first-class" types in Brighterscript.

From https://developer.roku.com/en-ca/docs/references/scenegraph/xml-elements/interface.md --

Type	Description	Done/Notes
integer, int	BrightScript integer type	✔️ (only integer)
longinteger	BrightScript longinteger type	✔️
float	BrightScript float type	✔️
string, str	BrightScript string type	✔️ (only string)
Boolean, bool	BrightScript Boolean type	✔️ (only boolean)
vector2d	X/Y coordinate array	could be implemented as float[]
color	Color type	is this a string or an int?
time	Time type	what even is this?
uri	A URL identifier	could be string
node	SceneGraph node object reference	Best to wait until we have full typing of built-in components (e.g. #435)
floatarray	Array of float	✔️ float[] - requires TypeExpression lookup
intarray	Array of integer	✔️ integer[] - requires TypeExpression lookup
boolarray	Array of Boolean	✔️ boolean[] - requires TypeExpression lookup
stringarray	Array of string	✔️ string[] - requires TypeExpression lookup
vector2darray	Array of vector2d	✔️ vector2d[] - requires TypeExpression lookup
colorarray	Array of color	Can be completed once color is defined
timearray	Array of time	Can be completed once time is defined
nodearray	Array of SceneGraph node object reference	Can be completed once node is defined
assocarray	Associative array	This is a special case of object - will benefit from #435
array	Array of objects - type specifier can be either array or roArray	✔️ - will benefit from #435
rect2D	An associative array with 4 float values: (x, y, width, height)x and y represent the coordinates of the top left corner of the rectangle	basically an interface!
rect2DArray	Array of rect2D associative arrays	Can be completed once rect2d is defined

Concerns:

These are really common words, (time, color, etc)... perhaps the actual keyword could be something like timeType... Another option is to put them in a namespace: SceneGraph.time ... etc.

[markwpearce]

Completed, as of #1016