Implemented warning for non-secure dapp opening#297

Diaglyonok wants to merge 3 commits intomytonwallet-org:mastermytonwallet-org/mytonwallet:masterfrom

Diaglyonok:bugfix/warning-non-secure-for-dappDiaglyonok/mytonwallet_fork:bugfix/warning-non-secure-for-dappCopy head branch name to clipboard