Implement basic keyboard views
Use existing concepts of levels and modifier latches and locks to implement the three view design of issue #38. The use of a lock to switch from letter to numbers and a latch to handle upper and lower case has side effects, but these can be addressed in a future commit.
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		@ -167,6 +167,9 @@
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  </key>
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  <key keycode="66" name="ALTGR">
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    <keysym keyval="65027">ISO_Level3_Shift</keysym>
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    <keysym keyval="65027">ISO_Level3_Shift</keysym>
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    <keysym keyval="65027" label="ABC">ISO_Level3_Shift</keysym>
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    <keysym keyval="65027" label="ABC">ISO_Level3_Shift</keysym>
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  </key>
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  <key keycode="38" name="AC01">
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    <keysym keyval="97">a</keysym>
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@ -235,6 +238,9 @@
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  </key>
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  <key keycode="50" name="LFSH">
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    <keysym keyval="65505">Shift_L</keysym>
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    <keysym keyval="65505">Shift_L</keysym>
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    <keysym keyval="65505" label="=/+">Shift_L</keysym>
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    <keysym keyval="65505" label="123">Shift_L</keysym>
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  </key>
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  <key keycode="52" name="AB01">
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    <keysym keyval="122">z</keysym>
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@ -208,10 +208,22 @@ set_level_from_modifiers (EekKeyboard *self)
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    EekKeyboardPrivate *priv = EEK_KEYBOARD_GET_PRIVATE(self);
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    gint level = 0;
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    if (priv->modifiers & priv->alt_gr_mask)
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    if (priv->modifiers & priv->alt_gr_mask) {
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        /* Alt-Gr is the 123 and ABC keys */
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        priv->modifier_behavior = EEK_MODIFIER_BEHAVIOR_LOCK;
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        level |= 2;
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    if (priv->modifiers & EEK_SHIFT_MASK)
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    }
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    if (priv->modifiers & EEK_SHIFT_MASK) {
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        /* Left Shift is the Shift and =/+ keys */
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        level |= 1;
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        if (level == 1)
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            priv->modifier_behavior = EEK_MODIFIER_BEHAVIOR_LATCH;
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        else
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            priv->modifier_behavior = EEK_MODIFIER_BEHAVIOR_LOCK;
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    }
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    eek_element_set_level (EEK_ELEMENT(self), level);
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}
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