pgAdmin 4 commit: Fixed below review comments for QueryTool

Fixed below review comments for QueryTool
 - The button bar be moved out into an HTML template
 - create.sql should perhaps be renamed to insert.sql
 - The "Add Row" button only works if you're on the last page of the resultset.
 - Use one wcDocker instead of two
 - Added support of code folding

Branch
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master

Details
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http://git.postgresql.org/gitweb?p=pgadmin4.git;a=commitdiff;h=894002b06df53d84c735eb8969e98ec4c6b4aba0

Modified Files
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.../tools/datagrid/templates/datagrid/index.html   | 114 ++++++++-
web/pgadmin/tools/sqleditor/command.py             |   2 +-
.../tools/sqleditor/static/css/sqleditor.css       |  39 +++-
.../sqleditor/templates/sqleditor/js/sqleditor.js  | 254 ++++++---------------
.../templates/sqleditor/sql/9.1_plus/create.sql    |   8 -
.../templates/sqleditor/sql/9.1_plus/insert.sql    |   8 +
6 files changed, 219 insertions(+), 206 deletions(-)