Docs updates.

Several small features and such, including updated graphics as needed.

doc/2-interface/asset-list.md

@@ -24,6 +24,8 @@ buttons from left to right:
 - **Move down**: same, but downward.
 - **Delete**: deletes the currently selected instrument. pattern data will be adjusted to use the next available instrument in the list.
 
+instruments may be dragged and dropped to reorder them. this will change instrument numbers throughout the module accordingly.
+
 ## folder view
 
 ![instruments window in folder view](instruments-folder.png)
@@ -39,7 +41,7 @@ right-clicking on a folder allows one to rename or delete it. deleting a folder
 
 ![wavetables window](wavetables.png)
 
-everything from the instrument list applies here also, with one major difference: moving waves around with the buttons will change their associated numbers in the list but **not** in pattern or instrument data. be careful!
+everything from the instrument list applies here also, with one major difference: moving waves around with the buttons or dragging them will change their associated numbers in the list but **not** in pattern or instrument data. be careful!
 
 wavetables are saved as Furnace wavetable (.fuw) files. 
 

doc/2-interface/menu-bar.md

@@ -64,6 +64,7 @@ the menu bar allows you to select from five menus: file, edit, settings, window
 - **randomize**: replaces the selection with random values.
   - does not affect the note column.
   - **Nibble mode**: when enabled, the randomization will be per-nibble (0 to F) rather than per-value (00 to FF).
+  - **Set effect:**: only appears when the selection includes an effect column. if enabled, an input box will appear. instead of being randomized, all effect types in the selection will be changed to the value entered.
 - **invert values**: `00` becomes `FF`, `01` becomes `FE`, `02` becomes `FD` and so on.
 - **flip selection**: flips the selection so it is backwards.
 - **collapse/expand amount**: allows you to specify how much to collapse/expand in the next two menu items.

doc/2-interface/settings.md

@@ -284,6 +284,7 @@ below all the binds, select a key from the dropdown list to add it. it will appe
 - **Double-click time (seconds)**: maximum time between mouse clicks to recognize them as a double-click.
 - **Don't raise pattern editor on click**
 - **Focus pattern editor when selecting instrument**
+- **Draggable instruments/samples/waves:** allow dragging and dropping assets within their lists to reorder them.
 - **Note preview behavior:** allows you to disable note preview when entering notes in the pattern.
   - **Never**: don't preview notes at all.
   - **When cursor is in Note column**: only when the cursor is in the Note column