Fix redraw problems in preview frames and debug panel

The problem was that direct call of RefreshView (now DrawView) doesn't
generate EVT_PAINT (at least on GNU/Linux with Wayland and wxgtk build
with gtk3+ support).
Now RefreshView simply triggers EVT_PAINT and EVT_PAINT handler does actual work.

     1

     2

                  <xsd:element name="Linux">

     3

                    <xsd:complexType>

     4

                      %(toolchain_gcc)s

     5

                    </xsd:complexType>

     6

                  </xsd:element>