Percent-Encode Local File URLs for Embedded Web Pages (#15961)

* Percent-Encode Local File URLs for Embedded Web Pages

The Home tab, setup wizard, Project tab and other embedded pages were
loaded from file:// URLs built by pasting the resources path into a
string. A '#', '%' or '?' in the install path was then read as a URL
fragment, escape or query, so the pages failed to load, for example a
portable install under D:\#OneDrive showed a directory listing instead
of the setup wizard.

Add file_url_from_path(), built on wxFileSystem::FileNameToURL, and use
it wherever a local page or image URL is built from a path. Queries such
as ?lang= are appended after the path is encoded. The wizard's printer
cover images are passed to the page as file URLs too.

* Encode the Login Error Page URL and Cover More Windows Path Forms

The login dialog's error page was still loaded from a raw resources path;
it now uses file_url_from_path like the other local pages.

The Windows file URL tests now also cover a resources path joined with a
forward-slash relative path, as the callers build them, and a UNC path.

* Build the Flush Dialog Page URLs with the Shared Helper

WipingDialog and NozzleListTable still called
wxFileSystem::FileNameToURL directly. They now go through
file_url_from_path like every other local page, so the URLs are built
in one place.

Adds a test for a resources directory with a '#' in its name, which the
plugin page check did not recognise before.

src/slic3r/GUI/GUI.cpp

@@ -14,6 +14,9 @@
 #include <boost/algorithm/string/predicate.hpp>
 #include <boost/any.hpp>
 
+#include <wx/filename.h>
+#include <wx/filesys.h>
+
 #if __APPLE__
 #import <IOKit/pwr_mgt/IOPMLib.h>
 #elif _WIN32
@@ -531,6 +534,11 @@ boost::filesystem::path into_path(const wxString &str)
 	return boost::filesystem::path(str.wx_str());
 }
 
+wxString file_url_from_path(const boost::filesystem::path &path)
+{
+	return wxFileSystem::FileNameToURL(wxFileName(from_path(path)));
+}
+
 void about()
 {
     AboutDialog dlg;