add support for floating drawings

- added need elements and test for them

src/file/drawing/floating/floating-position.ts

@@ -0,0 +1,60 @@
+// http://officeopenxml.com/drwPicFloating-position.php
+
+export enum HorizontalPositionRelativeFrom {
+    CHARACTER = "character",
+    COLUMN = "column",
+    INSIDE_MARGIN = "insideMargin",
+    LEFT_MARGIN = "leftMargin",
+    MARGIN = "margin",
+    OUTSIDE_MARGIN = "outsideMargin",
+    PAGE = "page",
+    RIGHT_MARGIN = "rightMargin",
+}
+
+export enum VerticalPositionRelativeFrom {
+    BOTTOM_MARGIN = "bottomMargin",
+    INSIDE_MARGIN = "insideMargin",
+    LINE = "line",
+    MARGIN = "margin",
+    OUTSIDE_MARGIN = "outsideMargin",
+    PAGE = "page",
+    PARAGRAPH = "paragraph",
+    TOP_MARGIN = "topMargin",
+}
+
+export enum HorizontalPositionAlign {
+    CENTER = "center",
+    INSIDE = "inside",
+    LEFT = "left",
+    OUTSIDE = "outside",
+    RIGHT = "right",
+}
+
+export enum VerticalPositionAlign {
+    BOTTOM = "bottom",
+    CENTER = "center",
+    INSIDE = "inside",
+    OUTSIDE = "outside",
+    TOP = "top",
+}
+
+export interface HorizontalPositionOptions {
+    relative: HorizontalPositionRelativeFrom;
+    align?: HorizontalPositionAlign;
+    offset?: number;
+}
+
+export interface VerticalPositionOptions {
+    relative: VerticalPositionRelativeFrom;
+    align?: VerticalPositionAlign;
+    offset?: number;
+}
+
+export interface Floating {
+    horizontalPosition: HorizontalPositionOptions;
+    verticalPosition: VerticalPositionOptions;
+    allowOverlap?: boolean;
+    lockAnchor?: boolean;
+    behindDocument?: boolean;
+    layoutInCell?: boolean;
+}