Support for joins partially done

[orlleite]

• Changed input query to textarea query (multilines);
• Added monospace font to query field;
• Copied processFromToken to processJoinToken;
• Renamed and edited getTableName to getTableNames to return String[];
• Edited getTableData receives String[] tableNames and could handle those situations in future;
• Edited getTableData if got more than one tableName, it will not replace query string values so it will be able to show the result but not editing values.

[amitshekhariitbhu]

@orlleite Please explain why you declared it as a partial? Also, it would be great if you make a PR against the development branch.

[orlleite]

I'm sorry, I don't remember precisely. I thought there are two ways of running queries. I'm assuming that, because I saw some "IFs" in the code. I changed it enough to make it works for me.

I said 'partially' because I'm not confident to say 'completely'.