Fix SetColumnOffset() subtracting a bool value instead of scrollbar width.

Version number 1.33

GetColumnOffset() / SetColumnOffset() fixes. (cf #125) ...

Actually ignore window padding, and don't subtract
window->DC.ColumnsStartX like older version did.

Tweaking Columns() examples.

GetColumnOffset() / SetColumnOffset() takes account of window padding properly (cf. #125)

Reworked Columns() examples.

Separator() within column correctly vertical offset all columns content (pointed out in #125)

Removed extraneous (1,1) padding on child window (pointed out in #125)

Comments and changed ImVec2 parameters to const ImVec2&

Fix hovering of child window extending past their parent not taking account of parent clipping rectangle (Fix #137)

Comments

Version number

InputText: cursor/selection/undo stack persist when using other widgets and getting back to same (#134) ...

Using SetKeyboardFocusHere() in particular on last used text edit revive
the cursor/selection.

InputText: minor tidying up.

Comments

Having a InputText() active doesn't steal mouse inputs (relate to #134)

Clearing ImGuiState, may switch back to memset(0) but that would put a requirement on user defined ImVector<> to be zero-fill compat

BeginChild() return a bool analoguous to Begin(). if true you can skip submitting content.

Columns: doesn't incorrectly bail out when SkipItems is set (fix #136)

BeginChild() variant goes after the main one

Child window explicitly inherit collapse state from parent.

Added IsAnyItemActive()

ImGuiTextFilter() can take a default filter string

Sliders: value is clipped inside the frame when resizing sliders to be small.

InputText: size for allowed input size smaller than necessary by 1 byte.

Fix ImFont::BuildLookupTable() potential dangling pointer dereference (fix #131)

ImGuITextFilter::Draw() use regular width call.

Version number + comment

Calculate frame-rate for the user, as a purely luxurious feature ...

..and to reduce sample code size a little.

Minor formatting tweaks, comments