[democracy] proposal submission

[brenzi]

The app should allow submitting all kinds of proposals, for community level and global

User Story

1. on democracy page, user taps (+) button to start submission of new proposal
2. new page opens with a form to enter proposal data
3. submit proposal

Proposal entry form:

• ProposalAction (default to petition)
• scope: global or currently selected cid (default to local, if allowed)
• fields depending on proposal action.....
  • addlocation: text entry lat and lon
  • updateDemurrage: enter demurrage as percent per month (show current value)
  • updateNominalIncome: enter amount (show current amount)
  • setInactivityTimeout: enter number of cycles (show current value)
  • petition: enter text (bounded)
  • spenNative: beneficiary, amount (beneficiary same entry field as "send", with contacts and own accounts as dropdown)
  • issueSwapNativeOption:
    • beneficiary (beneficiary same entry field as "send", with contacts and own accounts as dropdown)
    • allowance: KSM value, apply decimals
    • rate: How many units of community currency will you pay to get one native token (decimals applied)
    • do_burn: hardcode to true,
    • validity/expiry: None
    • (optional) extension: hardcode a LUT CC/fiat + fetch KSM/fiat exchange rate and autofill rate

exclude:

• remove location (because it needs to fetch existing locations to select the ones to delete)
• updateMetadata

ProposalActions and scope:
https://github.com/encointer/pallets/blob/e68dc324d5a3bab217ecf06ce7d0239e24987ffd/primitives/src/democracy.rs#L70-L80