Appropriate Error Handling

[Kautenja]

In many cases, debug assertions can be replace with exceptions in runtime code with no cost (assuming they never throw). In particular, errors can be thrown when:

• [x] attempting to set an output buffer for a nonexistent oscillator (i.e., index out of bounds error)
• [x] attempting to write data to a nonexistent register / RAM address (i.e., index of out bounds error)
• [x] time underflow (time should never underflow in bug-free code)

This isn't useful for VCV Rack, but is useful when using the dsp code as a library in other projects. It's also more readable and clear.

[Kautenja]

Updated for the 10 chip emulations that rely on BLIPBuffer.

• AddressSpaceException thrown for attempting to access an invalid register
• ChannelOutOfBoundsException thrown when attempting to set an output buffer for a nonexistent channel
• Exception thrown in general cases where a specific exception subclass would cause type pollution

all exceptions implement the what() protocol to provide information about the cause of failure.