Replace OutputSpendStatus with SpendInfo

[Sosthene00]

Pretty straightforward, I replaced the enum OutputSpendStatus with a new SpendInfo:

• The enum was making us lose information when transaction passed from Spent to Mined
• It doesn't transcribe as well in a sql format (see Wallet sqlite dana#272)

[cygnet3]

Made a PR for this on the Dana side to support this: cygnet3/dana#292

[Sosthene00]

#102 makes it without object, closing