Majorly re-organize modules

- Split large modules into smaller parts (e.g. siren-text-manipulation)
- Organize modules into high level groups:
  - completion
  - core
  - editor
  - languages
  - linting
  - misc
  - navigation
  - projects
  - spelling
  - text-editing
  - version-control
  - windows
  - workspaces

modules/completion/siren-auto-complete.el

@@ -0,0 +1,34 @@
+;;; siren-auto-complete.el --- jimeh's Emacs Siren: auto-complete configuration.
+
+;;; Commentary:
+
+;; Basic configuration for auto-complete.
+
+;;; Code:
+
+(require 'siren-flyspell)
+
+(use-package auto-complete
+  :bind (:map ac-completing-map
+              ("RET" . ac-complete)
+              ("C-m" . ac-complete)
+              ("C-s" . ac-isearch)
+              ("C-n" . ac-next)
+              ("C-p" . ac-previous))
+  :config
+  (ac-flyspell-workaround)
+
+  (setq ac-auto-show-menu 0.2
+        ac-auto-start 3
+        ac-delay 0.05
+        ac-menu-height 15)
+
+  ;; Auto-complete when indenting.
+  (defadvice indent-for-tab-command (around ac-before-indent activate)
+    "Call `auto-complete' if text was recently entered."
+    (if (ac-trigger-command-p last-command)
+        (auto-complete)
+      ad-do-it)))
+
+(provide 'siren-auto-complete)
+;;; siren-auto-complete.el ends here

modules/completion/siren-company.el

@@ -0,0 +1,49 @@
+;;; siren-company.el --- jimeh's Emacs Siren: company configuration.
+
+;;; Commentary:
+
+;; Basic configuration for company. Auto completion on steroids.
+
+;;; Code:
+
+(require 'siren-fci)
+
+(use-package company
+  :init
+  (defun company-turn-off-fci (&rest ignore)
+    (when (boundp 'fci-mode)
+      (setq company-fci-mode-on-p fci-mode)
+      (when fci-mode (fci-mode -1))))
+
+  (defun company-maybe-turn-on-fci (&rest ignore)
+    (when company-fci-mode-on-p (fci-mode 1)))
+
+  :config
+  ;; work-around for issues with fci-mode
+  (defvar-local company-fci-mode-on-p nil)
+
+  (add-hook 'company-completion-started-hook 'company-turn-off-fci)
+  (add-hook 'company-completion-finished-hook 'company-maybe-turn-on-fci)
+  (add-hook 'company-completion-cancelled-hook 'company-maybe-turn-on-fci)
+
+  (setq company-begin-commands '(self-insert-command)
+        company-dabbrev-downcase nil
+        company-echo-delay 0
+        company-idle-delay 0.3
+        company-minimum-prefix-length 2
+        company-tooltip-limit 20
+        ;; invert the navigation direction if the the completion popup-isearch-match
+        ;; is displayed on top (happens near the bottom of windows)
+        company-tooltip-flip-when-above t)
+
+  (global-company-mode 1)
+
+  ;; Customize keybindings for navigating up/down the completion popup list.
+  (define-key company-active-map (kbd "C-n") #'company-select-next)
+  (define-key company-active-map (kbd "C-p") #'company-select-previous)
+
+  ;; Enable indent and complete at point functionality by pressing tab.
+  (global-set-key (kbd "TAB") #'company-indent-or-complete-common))
+
+(provide 'siren-company)
+;;; siren-company.el ends here