Began work on real sql schema definitions, and migration engine

pkg/services/sqlstore/sqlsyntax/dialect.go

@@ -0,0 +1,18 @@
+package sqlsyntax
+
+type Dialect interface {
+	DBType() string
+	TableCheckSql(tableName string) (string, []interface{})
+}
+
+type Sqlite3 struct {
+}
+
+func (db *Sqlite3) DBType() string {
+	return "sqlite3"
+}
+
+func (db *Sqlite3) TableCheckSql(tableName string) (string, []interface{}) {
+	args := []interface{}{tableName}
+	return "SELECT name FROM sqlite_master WHERE type='table' and name = ?", args
+}