Semi/automatic escaping for reserved words as tables or columns

[NPCRUS]

I have a table called order, which is a reserved word in sql. So the query compiles into something like:

SELECT * FROM order

the desired query(Postgres) would be:

SELECT * from "order"

Current workaround is to set explicit schema name on table like this:
override def schemaName: String = "schemaName"

Obviously the same would apply for columns, so we need mechanism to escape column and table names

[NPCRUS]

So my thoughts on this issue:

1. seems like identifier delimit char is ultimately a " at least in currently supported databases + Microsoft SQL server, if another char for a different db appears, we could do it as a part of Dialect I think, so for now we can hardcode it
2. what needs to be delimited is reference to tables, columns and schemas(when applied explicitly in query)
3. it's seems that it's recommended pretty much to 100% escape or not escape at all table/column identifier
4. there are certain quirks when escaping table/column identifiers we need to keep in mind, eg: in sqlite table names are normally capitalized: USERS, and when you not escape them, sqlite will translate unescaped users -> USERS, however when you escape the table, sqlite will not perform this trick anymore, so it will be "users" -> "users" and therefore table will not be found, so in this case we will need to do capitalizing ourselves or maybe leave it to Config.tableNameMapper. There can be more stuff like this

In the end, I plan to use existing Table.resolve and make the same for Column, lots of resulting sql will be changed. Probably quite tedious job, but I need it in my project, so there's no other way

@lihaoyi please let me know if I forgot anything or maybe if you see it differently, otherwise I would like to start with implementation