Fix inspector keybinds (and add a couple)

SPC is kbd notation, in a pure keybind it actually means `S P C`. To
bind something to the space key we either use an actual space or use
`(kbd "SPC")`.

Also added S-SPC and page-down/up keys, since it most view-like modes
these are also bound to next and previous pages.

cider-inspector.el

@@ -60,8 +60,12 @@ The page size can be also changed interactively within the inspector."
     (define-key map [mouse-1] #'cider-inspector-operate-on-click)
     (define-key map "l" #'cider-inspector-pop)
     (define-key map "g" #'cider-inspector-refresh)
-    (define-key map "SPC" #'cider-inspector-next-page)
-    (define-key map "M-SPC" #'cider-inspector-prev-page)
+    ;; Page-up/down
+    (define-key map [next] #'cider-inspector-next-page)
+    (define-key map [prior] #'cider-inspector-prev-page)
+    (define-key map " " #'cider-inspector-next-page)
+    (define-key map (kbd "M-SPC") #'cider-inspector-prev-page)
+    (define-key map (kbd "S-SPC") #'cider-inspector-prev-page)
     (define-key map "s" #'cider-inspector-set-page-size)
     (define-key map [tab] #'cider-inspector-next-inspectable-object)
     (define-key map "\C-i" #'cider-inspector-next-inspectable-object)