build core, basic and go variants and add template

core/shell/tmux.conf

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+# Set default shell
+set -g default-shell /bin/bash
+
+# Increase history size
+set -g history-limit 50000
+
+# Disable escape delay
+set-option -sg escape-time 0
+
+# Enable mouse and focus events
+set -g mouse on
+set -g focus-events on
+
+################
+# Key bindings #
+################
+
+# Change prefix
+set-option -g prefix C-a
+
+# Remap split commands
+unbind '"'
+unbind %
+bind s split-window -v
+bind v split-window -h
+
+# Remap pane selection
+unbind Up
+unbind Down
+unbind Left
+unbind Right
+
+is_vim="ps -o state= -o comm= -t '#{pane_tty}' \
+    | grep -iqE '^[^TXZ ]+ +(\\S+\\/)?g?(view|l?n?vim?x?)(diff)?$'"
+bind-key -n 'M-h' if-shell "$is_vim" { send-keys M-h } { if-shell -F '#{pane_at_left}'    {} { select-pane -L } }
+bind-key -n 'M-j' if-shell "$is_vim" { send-keys M-j } { if-shell -F '#{pane_at_bottom}'  {} { select-pane -D } }
+bind-key -n 'M-k' if-shell "$is_vim" { send-keys M-k } { if-shell -F '#{pane_at_top}'     {} { select-pane -U } }
+bind-key -n 'M-l' if-shell "$is_vim" { send-keys M-l } { if-shell -F '#{pane_at_right}'   {} { select-pane -R } }
+
+# Remap resize
+unbind C-Up
+unbind C-Down
+unbind C-Left
+unbind C-Right
+unbind M-Up
+unbind M-Down
+unbind M-Left
+unbind M-Right
+bind -nr M-K resize-pane -U
+bind -nr M-J resize-pane -D
+bind -nr M-H resize-pane -L
+bind -nr M-L resize-pane -R
+
+##########
+# Design #
+##########
+
+# Borders
+set -g pane-border-style 'fg=colour12'
+set -g pane-active-border-style 'fg=colour12'
+
+# Statusbar
+set -g status-position bottom
+set -g status-justify left
+set -g status-style 'bg=colour235'
+set -g status-left ''
+
+# Command line and messages
+set -g message-style 'bg=color235'
+set -g display-time 4000
+
+# Tabs
+setw -g window-status-current-style 'bg=colour238 bold'
+setw -g window-status-current-format ' #[fg=color245]#I#[fg=colour250] #W '
+setw -g window-status-style 'bg=colour236'
+setw -g window-status-format ' #[fg=colour240]#I#[fg=colour245] #W '
+
+# Clock
+set -g status-right '#[fg=colour0,bg=colour240] %H:%M '
+set -g status-interval 10
+
+# Scroll number
+setw -g mode-style 'fg=colour240'