Add initial releasenotes for 1.7.3

releasenotes/1.7.3/release-1.7.3.markdown

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+# 1.7.4: Leatherbacks 
+
+A small intermediate release with a few fixes, mostly in documentation and two great additions by Jakub Jiruta:
+
+ * An option to customize the combi mode display format. 
+ * To possibility to set tab stops on listview and entry boxes.
+
+# Changelog
+
+v1.7.4:
+   - [Help] Print out the parsed config/theme files in -help output.
+   - [Keybindings] Fix keybindings being modified by -theme-str
+   - [Doc] Add rofi-dmenu manpage.
+   - [XCB] Cache lookup of monitor.
+   - Add -replace option (#568)
+   - Fix memory leak.
+   - [1566] Add extra debug for resolving monitors.
+   - [Theme] Add round,floor,ceil function in @calc (#1569)
+   - [Doc] Explain icon lookup.
+   - [Combi] Add -combi-display-format (#1570) (thanks to Jakub)
+   - [Theme] Expand list type ([]) for more data types.
+   - [Theme] Add support for tab-stops on textbox. (#1571) (thanks to Jakub)
+   - [Theme] Testing direct access to widgets via cmdline option (-theme+widget+property value)
+
+# Thanks
+
+Big thanks to everybody reporting issues.
+Special thanks goes to:
+
+* Iggy
+* Quentin Glidic
+* Danny Colin
+* Jakub Jiruta
+
+Apologies if I mistyped or missed anybody.