Webscrapbook

* Implemented new GUI for the `Capture as` dialog.
* Various bug fixes and minor UI improvements.

* Fixed an issue that some resource files such as SVG be incorrectly included for links rebuilding.
* An error during links rebulding for a document no more terminates the capture task.
* Fixed missing meta attributes for the index.html when capturing a XHTML or SVG file.
* Pages other than index.html now records only source URL in meta attributes.
* Header content type now takes higher priority than filename when checking links for downloading.
* Added a new `capture.downLink.doc.mode` option for capturing linked pages using tab mode.
* Added `View sitemap` editor tool.
* Improved UI and tooltips for edit and postit dialog pages.

* Added support of saving meta refreshed pages for in-depth capture.
* An automatically opened remote tab is now closed on error.
* An error on capturing a linked page no more terminates the capture task.
* Improved internal processing and log messages for remote tab and in-depth capture.
* `ui.notifyPageCaptured` now defaults to true.
* Require server address field be filled when a backend server related option is used.
* Improved UI and tooltips for the options dialog.

* Added capture helper commands: `concat`, `slice`, `upper`, `lower`, `encode_uri`, `decode_uri`, `add`, `subtract`, `multiply`, `divide`, `mod`, and `power`.
* Reworked capture helper commands `attr`, `css`, and `options` to support the parameter pattern `[[name1, value1], [name2, value2], ...]`.
* Renamed capture helper commands `has_elem` to `has_node`.
* Reworked capture helper command `insert` to take JSON node data.
* Reworked capture helper commands `match` and `replace` to always return a string value.
* Reworked UI for the `Capture as` dialog as `Batch capture` and `Advanced capture` dialogs.
* Break words for option textareas.
* Improved some option tooltips.

* Improved UI for the `Capture as` dialog.
* Improved some option tooltips.

* Added a new `capture.faviconAttrs` option for saving favicon-like resources.
* Adjusted UI for the `Capture as` dialog.
* Added support of sidebar auto-rebuilding after a capture, with a new option `scrapbook.autoRebuildSidebars` to tweak the behavior..