Extends icalendar, adding objects needed for CAP.
Note: only implements a subset and not enough to even be compliant with [CAP].

Naming:

• Component classes ending "Comp" are abstract, base classes.
• Component classes not ending in "Comp" represent the corresponding CAP components.
• Property classes ending in "Prop" are abstract, base classes.
• Property classes not ending in "Prop" represent the corresponding CAP properties.
• All parameter classes end in "Param" (both base classes and those repesenting CAP parameters).
• All exception classes end in "Exception" and are derived from or are CAPException.

Other Classes:

• Config is mostly (but not exclusively) concerned with setting up the name-to-class lookup maps.
• Names, Strings, and Utilities define constants and utilities.

For classes whose documentation have a Spec section:

section:	corresponding section of [rfc]
occurs:	in what context may occur (in what quantities)
datatypes:	datatypes allowed (in what quantities)
default:	default value
allowed:	allowed values; e.g. for enumerated values
params:	parameters allowed (in what quantities)
props:	allowed properties (in what quantities)
comps:	allowed components (in what quantities)

(not all items will be present and form may vary from changing style).

e.g. for the NAME property:

	 
Spec:
  section:	8.23 [CAP-10]
  occurs:	(0+)
  datatypes:	TEXT (1)
  default:	---
  allowed:	---
  params:	LANGUAGE(0-1), ianaparam(0+), xparam(0+)