getsparkcoinaddr rpc added

[levonpetrosyan93]

• Add getsparkcoinaddr rpc, txid as an input

    getsparkcoinaddr "f5fa36512c0e178ae5866141afdb904fb0e4f9826f1fbd107f77bbaffa97273a"

    [
    {
        "address": "st17jw42xm3zdcthjfhtp002c3z36evfwapepwgfaq7h3q4f3gjgzhpqy4h9y9y67rxcr8vzvq9c4htev9gk4ycnal9lx0xp90muekjsccta8wa56rtf90fl8tfkj9k6rks4fqvjqcpu86xa",
                "memo": "",
                "amount": 1.00000000
    },
    {
        "address": "st17jw42xm3zdcthjfhtp002c3z36evfwapepwgfaq7h3q4f3gjgzhpqy4h9y9y67rxcr8vzvq9c4htev9gk4ycnal9lx0xp90muekjsccta8wa56rtf90fl8tfkj9k6rks4fqvjqcpu86xa",
                "memo": "",
                "amount": 1.00000000
    }
    ]

• Fix crashing bug in UI, which works on some rare cases, when trying to create a spark mint