Resolve "PoC: Automatic finalized budget submission"

See merge request crown/crown-core!126

Changed instant send database load order so budget knows about locked transactions

See merge request crown/crown-core!123

Relay instant transaction only when spork is on

See merge request crown/crown-core!125

Forbid to create masternode/systemnode if collateral transaction doesn't have enough confirmations

See merge request crown/crown-core!124

Broadcast locked transactions

See merge request crown/crown-core!116

Resolve "Rework - Change the alert that the user see's when attempting to submit votes after block 2880"

See merge request crown/crown-core!120

Added an additional check of wether voting fot a proposal is too
close to superblock or no. If it's too late - an eror message is
displayed.

Fixed an error in CBudgetManager::FindProposal() + covered with tests

See merge request crown/crown-core!117

Clean up docs in repository

See merge request crown/crown-core!115

Fixed warning messages

See merge request crown/crown-core!118

Refactored masternode/systemnode related functions to be const

See merge request crown/crown-core!119