Random Fixes (Python3)

[malvidin]

Addresses #42 , and it also fixes Int() to return floor of value and fixes Fix() to return the rounded value.

Because of differences between how Python versions implement random.seed(), the first 10 values generated by Rnd are returned from a list before using the Python random() function, unless Randomize is called.

[malvidin]

Implements the Visual Basic VB Math Random Functions. Still need to validate the following, which worked in a separate Python class before moving to this project:

• 1. Randomize without argument generates a new seed in the context using the current time.
• 2. Randomize with argument generates a new seed in the context.
• 3. Rnd with a negative argument generates the next random number using the argument as the seed.
• 4. Rnd with a zero argument generates the previous random number.
• 6. Rnd with a positive, or without argument, generates the next random number and generates a new seed.

https://github.com/microsoft/referencesource/blob/master/Microsoft.VisualBasic/runtime/msvbalib/Math.vb