Allow mw.log and console to handle multiple values

In the debug console, "=unpack( { 1, 2, 3 } )" prints only "1". And
similarly, "mw.log( 1, 2, 3 )" logs only "1". Since Lua uses multiple
return values extensively, this is not particularly helpful.

Following the lead of the lua command-line client, change these to
output multiple values by converting each one using tostring() and then
concatenating them with tab as a separator.

Change-Id: I791d4c92415fc722bbd7c62d0f5f88752d31fe07
2 files changed