tools/gn: rename char_offset to column_number
While looking at Location and trying to understand what char offset meant,
I got very confused, because in some languages, like Portuguese, it is
hard to translate offset and thus understand what it means. Actually
char offset is referring to the column number in text buffer, which is much
easier to understand and its meaning is instantly understood, since everyone is
familiar with the concenpt of rows (lines) and columns in a text editor.
BUG=None
TEST=gn gen + gn_unittests
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Review URL: https://codereview.chromium.org/1525183002
Cr-Commit-Position: refs/heads/master@{#367883}
13 files changed
