Split seed from the settings string

[pkmnfrk]

I realize there are benefits to having as part of the settings string, including easier sharing and bug reporting. However, I think for most cases, it is better to be separated. This PR makes the following changes:

• Removes the seed from the settings string (for compatibility, if the settings do include a seed, it is used, but new settings strings will exclude it)
• Generates the initial seed from an RNG, rather than the current time
• Adds a new seed button, to reroll the seed
• Re-adds the seed to the default output file name
• Explicitly adds the seed and settings string to the spoiler log (Fixes Spoiler log and ROM should include the seed #9)
• Modifies the spoiler log's file name to the be same as the output ROM (including path) (Fixes Spoiler log is generated in the program's directory, not the output directory #7)

Benefits:

• You can easily remember your favourite settings, and not have to worry about accidentally generating the exact same seed
• You can easily roll multiple games with the same settings
• More intuitive behaviour based on other randomizers (primarily looking at OOT, but I can't think of any other randomizer I have seen that does this)

[ZoeyZolotova]

I think the filename should still say SpoilerLog somewhere.

[ZoeyZolotova]

Unpleasant mixture of tabs and spaces here and elsewhere in this pull request.