[enh] Upgrading to TypeScript 3

app/lib/dal/fileDAL.ts

app/lib/dal/indexDAL/leveldb/LevelDBIindex.ts

app/lib/dal/indexDAL/leveldb/LevelDBMindex.ts

app/lib/dal/indexDAL/leveldb/LevelDBSindex.ts

app/lib/dal/sqliteDAL/AbstractSQLite.ts

app/lib/indexer.ts

app/modules/crawler/lib/sync/v2/GlobalIndexStream.ts

app/modules/prover/lib/blockGenerator.ts

package.json

test/integration/misc/http-api.ts

test/integration/tools/http-expect.ts

tslint.yaml

yarn.lock